Swing Bearing for Komatsu PC200-3 Excavator

This swing bearing replaces the slewing ring on Komatsu PC200-3 and PC220-3 excavators, cross-referencing OEM part numbers 205-25-00023 (also supplied as 205-25-00021 / 205-25-00022). It is an aftermarket part manufactured by Lyhc— not a Komatsu product — built to the same mounting envelope: 1,303 mm outside diameter, 1,084 mm bore, 104 mm overall height.

The swing circle carries the whole upper structure: boom, arm, bucket, hydraulic oil and counterweight. Every swing cycle loads the raceway with axial force, radial force and tilting moment at the same time, which is why this joint — not the swing motor — is usually the first thing to fail on a high-hour PC200-3.

1,303 mmOutside diameter

1,084 mmBore diameter

104 mmOverall height

≈ 240 kgUnit mass

Will it fit your machine?

Machine	OEM reference	Status
Komatsu PC200-3	205-25-00023	Direct fit
Komatsu PC220-3	205-25-00023	Direct fit
Komatsu PC200-3 (early / late serial)	205-25-00021 / 205-25-00022	Confirm by serial number
Komatsu PC200-5	20Y-25-11103	Not interchangeable — different height (110 mm)

Specifications

Parameter	Value
Machine fitment	Komatsu PC200-3, PC220-3
OEM reference	205-25-00023 (alt. 205-25-00021 / 205-25-00022)
Outside diameter	1,303 mm
Bore diameter	1,084 mm
Overall height	104 mm
Mass	≈ 240 kg
Ring material	50Mn or 42CrMo
Rolling element	GCr15 bearing steel
Raceway hardness	55–58 HRC
Seal	Double lip seal
Brand	Lyhc
Operating temperature	−30 °C to +80 °C
Mounting bolts	Supplied to drawing; torque table included
Structure	Single-row four point contact / cross roller — confirm against drawing

What actually kills a PC200-3 swing bearing

Machines in the field fail the same five ways. Knowing which one you are looking at tells you whether a new bearing alone will fix the problem.

Failure mode	What the operator notices	What we control in manufacturing
Seal failure, water ingress	Grease turns to emulsion, swing gets stiff, rust streaks at the joint	Double lip seal, grease quantity, sealing face finish
Raceway brinelling from idle vibration	Knock or hesitation at the start of swing	Raceway hardness and axial clearance
Gear tooth wear	Swing motor whines, teeth visibly sharpened	Tooth hardness, profile tolerance, pinion match
Bolt loosening, ring creep	Chucking, abnormal noise, cracked paint around bolt heads	Face flatness, hole position tolerance, torque table
Contaminated grease	Metal particles in the grease sample	Cleanliness control before sealing

Before you install

Measure the old ring — outside diameter, bore, height, bolt circle, hole size, tooth count. Compare against the drawing we send. Do not compare against the part number alone.

Clean both mounting faces. Burrs, weld spatter or paint build-up become a tilt once the bolts are torqued, and a tilted ring loses most of its rating.

Torque in stages, cross pattern to the value on the mounting sheet. Re-check after the first 50 hours.

Grease before the first rotation. Add the specified quantity, then rotate the upper structure by hand through two full turns.

Re-grease on schedule. Most premature failures we see are lubrication intervals, not bearing quality.

What ships with the part

Every unit is supplied with a dimension inspection report and a material certificate. A 2D drawing is issued for approval before production; a 3D model (STEP) is available on request for assembly checks. Packing is export-grade, bolted to a pallet or crated — a 240 kg ring that shifts in transit arrives out of tolerance.

Frequently asked

Will this swing bearing fit my Komatsu PC200-3?

It is built for PC200-3 and PC220-3 with OEM reference 205-25-00023. Because Komatsu changed the swing circle between generations, confirm your machine serial number or measure the old ring before ordering. The PC200-5 ring is close in size but differs in height.

What are the dimensions?

Outside diameter 1,303 mm, bore diameter 1,084 mm, overall height 104 mm, mass approximately 240 kg.

Is this a Komatsu genuine part?

No. It is an aftermarket replacement manufactured by Lyhc, which is not affiliated with, endorsed by or sponsored by Komatsu Ltd. The OEM part number is referenced only to identify the component it replaces.

How is the tooth count and bolt pattern confirmed?

We send a dimension drawing for approval before production. Check outside diameter, bore, height, bolt circle, hole size and tooth count against it — or send a photo of the old bearing and we verify the fitment for you.

Can you supply other PC200 generations?

Yes. PC200-1, PC200-5, PC200-6, PC200-7 and PC200-8 rings are produced to drawing or sample. Sizes differ between generations, so each is quoted separately.

What is the lead time?

Stock items ship in a few working days; production runs are quoted per order. Send the quantity and destination port for a firm date.

Send the serial number, get a drawing. A photo of the old bearing plus the machine serial number is usually enough for us to confirm the correct ring and quote